Abstract:There are a lot of huge boulders in the Lanmaqiang ( means wall for blocking horses) , Fota (means Pagoda) Valley in the Mengshan Mountain, Mengshan National Geopark, Shandong Province.
There is a big debate about the reasons for its formation. It is helpful to understand the formation of gravel deposits in the Fota Valley, Mengshan Mountain, to understand the environmental evolution and climate change in Mengshan Mountain area. The writers have discussed the micro geomorphology of gravel in Fota Valley. This article focuses on the in situ terrestrial cosmogenic nuclide (TCN) 10Be exposure dating of Lanmaqiang boulders deposits and the climate environment and human culture of Shandong Province since the Holocene . The results of the study indicate that: (1) The 10Be exposure ages of the Lanmaqiang boulders were about 5.0 ka, which does not support the conclusion of the previously published “8.2 ka Lanma glacial periods ”; （2）since Holocene, the Mengshan Mountain area of Shandong Province was in a warm and humid environment. Despite several cooling events, it was not enough to provide the conditions for the formation of glaciers.